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Method for improving recovery ratio of indigenous microbial enhanced oil recovery

A technology of endogenous microorganisms and recovery factor, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of reduced oil displacement effect, reduced metabolic activity, and inability to activate the bacteria widely, and achieves the cost Low, easy to operate, conducive to the effect of promotion and application

Inactive Publication Date: 2015-12-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for endogenous microbial flooding to enhance oil recovery. The present invention divides the endogenous activators of the target oil reservoir into oligotrophic activators and eutrophic activators. Each slug is injected into the oil reservoir sequentially. This method not only reduces the cost of microorganisms to enhance oil recovery, but also solves the problem that the bacteria cannot be widely activated, and the metabolic activity of the bacteria is reduced after a large number of reproductions, which leads to the reduction of oil displacement effect.

Method used

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  • Method for improving recovery ratio of indigenous microbial enhanced oil recovery
  • Method for improving recovery ratio of indigenous microbial enhanced oil recovery
  • Method for improving recovery ratio of indigenous microbial enhanced oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, taking a block A of Shengli Oilfield as an example

[0042] In a block A of Shengli Oilfield, the reservoir temperature is 60°C, the reservoir pressure is 12MPa, the porosity is 35.0%, and the pore volume is 2.8×10 4 m 3 , geological reserves 1.65×10 5 t, the formation water salinity is 16000mg / L, and the average water content of the block before the test is 96.5%. Utilize the method of the present invention to improve the recovery rate of this block A, concrete implementation steps are as follows:

[0043] (1) Collection of field fluid samples in the target reservoir

[0044] Use a sterile sampling barrel to collect fluid samples at the wellhead of the oil well in the target reservoir. The sample collection volume is 50L. After the collection is completed, it will be sent to the laboratory for oil-water separation within 4 hours, and 15L of formation water will be obtained.

[0045] (2) Analysis of endogenous microbial community structure

[0046] ①S...

Embodiment 2

[0067] Embodiment 2, taking a certain block B of Shengli Oilfield as an example

[0068] In a block B of Shengli Oilfield, the reservoir temperature is 65°C, the reservoir pressure is 13MPa, the porosity is 33.0%, and the pore volume is 5.2×10 4 m 3 , recoverable reserves 7.3×10 5 t, the formation water salinity is 9600mg / L, and the water content before the test is 92.8%. Utilize the method of the present invention to improve the recovery factor of this block B, concrete implementation steps are:

[0069] (1) Collection of field fluid samples in the target reservoir

[0070] Use a sterile sampling barrel to collect fluid samples at the wellhead of the oil well in the target reservoir. The sample collection volume is 55L. After the collection is completed, it will be sent to the laboratory for oil-water separation within 4 hours, and 17L of formation water will be obtained.

[0071] (2) Analysis of endogenous microbial community structure

[0072] ①Sample pretreatment: Pre...

Embodiment 3

[0091] Embodiment 3, taking a certain block C of Shengli Oilfield as an example

[0092] The temperature of reservoir C in a certain block of Shengli Oilfield is 70℃, and the reservoir pressure is 10MPa. Porosity 30.0%, pore volume 3.4×10 4 m 3 , recoverable reserves 5.2×10 4 t, the formation water salinity is 12000mg / L, and the water content before the test is 98.2%. Utilize the method of the present invention to improve the recovery factor of block C, concrete implementation steps are:

[0093] (1) Collection of field fluid samples in the target reservoir

[0094] Use a sterile sampling barrel to collect fluid samples at the wellhead of the oil well in the target reservoir. The sample collection volume is 60L. After the collection is completed, it will be sent to the laboratory for oil-water separation within 4 hours to obtain 20L of formation water.

[0095] (2) Analysis of endogenous microbial community structure

[0096] ①Sample pretreatment: The obtained formation ...

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Abstract

The invention discloses a method for improving the recovery ratio of indigenous microbial enhanced oil recovery. The method comprises the following steps: acquiring a fluid sample on a target reservoir site; analyzing an indigenous microbial community structure; determining an indigenous activator and the injection quantity thereof; selecting an on-site injection process of the indigenous activator; evaluating a physical analog enhanced oil recovery; performing on-site tests, and tracking and analyzing of on-site test effects. The method is reasonable, simple in process, easy to operate, safe and reliable, beneficial to on-site popularization and application, and low in investment and cost, greatly improves the on-site test effect, improves the recovery ratio of more than 12% during indigenous microbial enhanced oil recovery on-site tests, and thus can be widely applied to on-site tests for improving the recovery ratio of indigenous microbial enhanced oil recovery.

Description

technical field [0001] The invention belongs to the technical field of microbial oil flooding, and in particular relates to a method for improving oil recovery by endogenous microbial oil flooding. Background technique [0002] Microbial enhanced oil recovery is a comprehensive technology that uses the beneficial activities and metabolites of microorganisms in oil reservoirs to change the physical and chemical properties of crude oil and improve the fluidity of crude oil, thereby enhancing oil recovery. As long as an appropriate amount of nutrients is provided, the original microorganisms in the oil reservoir can be activated, and the oil recovery can be enhanced through the microorganisms themselves and their metabolites. Compared with other enhanced oil recovery technologies, this technology has the advantages of wide application range, simple operation, and no pollution to the formation and the environment. [0003] In the current microbial flooding field test, in order ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 李希明胡婧吴晓玲孙刚正徐登霆宋欣段传慧徐闯刘涛冯云
Owner CHINA PETROLEUM & CHEM CORP
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